When I worked at Etsy (a couple years ago now, so this is out of date), devs wrote `ALTER` statements and included them in a ticket. Once a week, the DBAs would

When I worked at Etsy (a couple years ago now, so this is out of date), devs wrote `ALTER` statements and included them in a ticket. Once a week, the DBAs would run all the migrations. The only real things I remember worrying about was making sure to set a default if you were adding a column, and if you were changing a large table, it'd take a long time. My current company uses mongodb, so migrations aren't a thing. It's pretty nice, TBH.